A question of etiquette

Recently whilst in Sri Lanka I visited an internet cafe. The proprietor kept me waiting for quite a number of minutes while he used the computer himself. Finally he signalled for me to take my turn. To my suprise there were three separate windows of porn open. Not knowing quite what I should do I took a very quick peak at the little Asian woman and the big black man on the screen, giggled slightly, then closed the windows before opening up another to check my email. Once I was done I got up to pay the man. He looked at the computer and seemed a little bemused. Was I wrong to close his three windows of porn? Really, what is the correct etiquette in this situation?